With most other hubs you can replace the bearings at home provided you have your own bearing press.
Cycleops ceramic bearings.
The reason you cannot replace powertap bearings is that the hub needs to be recalibrated after new bearings are pressed in.
I have campagnolo freehub but it is less than one year old switch from shimano to campy late last year so i am thinking the bearings in it are fine.
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I was looking at these bikeman abi enduro zero ceramic grade 3 6902 sealed bearing 15 x 28 x 7mm but honestly have no idea if that is a good bearing or a good price.
I had a new sl hub that would eat bearings every 300 miles.
Just so you know it s not the bearings that fail it s the machining of the hub that loads the bearings too much.
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Search there are plenty of powertap bearing issues just on this forum.
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